Unit 2

Question 1

___________ and _____________ processes work together to create soil aggregates.

Answer 1

Cohesion and fragmentation

Question 2

It is an unconsolidated, or loose, combination of organic and inorganic materials.

Answer 2

Soil

Question 3

Granular soil have good load bearing qualities. It is permeable hence they drain easily. They are comparatively incompressible when subjected to static loads. Not subject to changes in strength or volume due to variation in after content.

Question 4

Determine the particle size distribution of soil and it is used to classify/identify the soil.

Answer 4

Particle Size Analysis of Soil

Question 5

The lowest moisture content at which the soil will flow upon the application of a very small shearing force.

Answer 5

Liquid Limit

Question 6

The minimum moisture content at which the soil can be readily molded without breaking or crumbling.

Answer 6

Plastic Limit

Question 7

It is a process of increasing soil density and removing air, usually by mechanical means.

Answer 7

Compaction

Question 8

This involves the granular rearrangement of soil particles at a number of moisture contents ranging from slightly sry to very wet by a specified amount of energy applied on a specified manner.

Answer 8

Compaction Test

Question 9

The purpose of compaction test is to determine the amount of mixing water (Optimum Moisture Content) and Maximum Dry Density (True or False)

Answer 9

True

Question 10

It is a method of evaluating the relative quality of subgrade, subbase, and base soil for pavements.

Answer 10

California Bearing Ration

Question 11

This test evaluates the structural strength of coarse aggregate. It gives an indication of quality as determined by resistance to impact and wear.

Answer 11

Abrasion Test

Question 12

These are the most mined material in the world. Defined as inert, granular & inorganic materials that normally consist of stone or stone - like solids.

Answer 12

Aggregates

Question 13

Approximately _____ of the volume of Portland cement concrete is occupied by aggregates. They provide compressive strength and bulk to concrete.

Answer 13

3/4

Question 14

Extracted from larger rock formations through an open excavation (quarry) and reduced to usable sizes by mechanical crushing or grinding (sand, crushed limestone, gravel)

Answer 14

Natural Aggregates

Question 15

To evaluate/determine the particle size distribution of aggregates.

Answer 15

Sieve Analysis / Grading Test

Question 16

_____________ or _____________ of aggregates is an important characteristic because it determines the paste requirement for workable concrete.

Answer 16

Grading or size distribution

Question 17

A sample of well-graded aggregate containing minimum voids will require _____________ to fill up the voids in the aggregates.

Answer 17

minimum paste

Question 18

Maximum size of aggregate (MSA) should not be greater than thickness of section or slab divided by 4 (True or False)

Answer 18

True

Question 19

The smallest sieve through which 100 percent of the aggregate sample particle pass. “One sieve large than the nominal maximum size.”

Answer 19

Maximum Size Aggregates

Question 20

The largest sieve that retains some of the aggregate particles but generally not more than 10 percent by weight. It is one size larger than the first sieve to retain more than 10 percent of the material.

Answer 20

Nominal Maximum Size of Aggregates

Question 21

The ration of the mass of a solid or liquid to the mass of an equal volume of distilled water 4°C.

Answer 21

Specific Gravity Aggregates

Question 22

Full absorbent

Answer 22

Oven dry

Question 23

Dry at the particle surface but containing some interior moisture, thus still somewhat absorbent Saturated surface dry (SSD) - neither absorbing water from nor contributing water to the concrete mixture.

Answer 23

Air Dry

Question 24

Containing an excess of moisture on the surface (free water).

Answer 24

Damp or wet

Question 25

The test determines the presence of injurious organic compounds in natural sand (to be used in cement mortar or concrete).

Answer 25

Organic Impurities in Fine Aggregates

Question 26

This is usually being used for Bituminous or Asphalt Mix

Answer 26

Composite Aggregates